Method of making hermetical joints or coating receptacles.



7 which get spoiled in contact with Patented February 21, 1905.

UNITED STATES PATENT OFFICE.

LOUIS LE GOUPIL, OF PARIS, FRANCE.

METHOD OF MAKING HERMETICAL JOINTS 0R COATING RECEPTACLES.

SPECIFICATION forming part of Letters Patent No. 783,054, dated February 21, 1905. Application filed November 8, 1904. Serial No. 231,951.

To all whom it may concern:

Be it known that I, LOUIS LE GOUPIL, a citizen of France, residing at 213 Rue de Belleville, Paris, France, have invented new and useful Improvements in Methods of Making Hermetical Joints or Coating Receptacles, of which the following is a specification.

This invention relates to a method of making hermetical joints for preserve-boxes and other receptacles with a view of suppressing the use of india-rubber rings and the like, oils or greasy substances.

This method allows also of preventing the oxidation of the metal of the boxes or capsules of bottles at the places where, owing to the removal of the tinning, the metal is directly in contact with the juice or preserves.

The new method consists in coating the edge of the cover to be set or of the part of the box or capsule to be protected against oxidation, first, with a layer of a solution formed by melting in five hundred grams of boiling water one hundred grams of sugar, by letting said solution cool at centigrade, by adding thereto one hundred grams of gelatin previously swollen in cold water, and by adding finally thereto two grams of thymol; second, with a layer of a second solution applied on the first layer and formed by dissolving in five hundred grams of cold water twenty-five grams of potash alum and adding thereto one hundred grams of formic aldehyde at fifty per cent. The first gelatinous solution gets tanned and becomes very adhesive, hard, and elastic under the infiuence of the formic aldehyde and the alum. The cover thus prepared (or, according as may be the case, the box or the capsule of the bottle) may then be dried in a drying-stove oven strongly heated and then set in the usual manner. The joint formed by this method is quite hermetic, it is imputrescible, unattackable by the acids and greasy matters, and does not get spoiled either by the heat or by dampness. As to the boxes or capsules of bottles coated by the same method they have the advantage of presenting a very smooth and tight coating of an imputrescible substance which does not fear the contact of greasy matters or pickles and which is capable of supporting high temperatures.

In applying the method hereinabove described some of the substances mentioned may be replaced by others having more or less the same properties. Thus, for instance, the sugar, which is adapted to prevent the gelatin from changing of volumethat is to say, from getting lengthened or shortened, and hence from crackingcan be replaced by glycerin. Likewise the thymol, which is adapted to render the gelatin of the first solution imputrescible before being used, can be replaced by boracic acid or other antiseptic giving no bad smell. Likewise, also, the second solution of formic aldehyde could be replaced by other tanning matters, such as chrome, tanning extracts of certain woods, or even in certain cases by tannin or tannic compositions. Finally, the alum, which is adapted to cause the composition to adhere to the walls to which it is applied, could in case of need be suppressed, especially Where very thick layers of composition would be applied.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A method of making hermetical joints for preserve-boxes and for bottles or of coating the inside of said boxes or of metallic capsules for bottles with the View of protecting same against oxidation, consisting in applying on the edges of the covers to be set or on the parts of the boxes or capsules to be protected a first layer of a solution formed of water, gelatin, sugar and thymol and a second layer of a solution formed of water, formic aldehyde at fifty per cent. and potash alum, substantially as and for the purpose set forth.

2. A method of making hermetical joints for preserve-boxes and for bottles or of coating the inside of said boxes or of metallic capsules for bottles with the view of protecting same against oxidation, consisting in applying on the edges of the covers to be set or on the parts of the boxes or capsules to be protected a first layer of a solution formed of five hundred l In testimony whereof I have signed my name to this specification in the presence of two suh- I scribing witnesses.

LOUIS LE GOUPIL.

Witnesses:

ANTOINE LAVOIX, J OHN BAKER. 

